Pole bracket insulator assembly



Oct. 15, 1957 s. c. SUGARMAN 2,310,012

POLE BRACKET INSULATOR ASSEMBLY Filed D80. 27, 1954 INVENTOR. STANLEY C. 5U GA RMAN United States Patent M 2,810,012 POLE BRACKET INSULATOR ASSEMBLY Stanley C. Sugarman, Phoenix, Ariz. Application December 27, 1954, Serial No. 477,697 3 Claims. (Cl. 174-161) This invention concerns pole brackets for insulators attached directly to poles and supporting medium voltage transmission wires.

Wires of the type here concerned carry voltage of the order of 200 to 600, and rather heavy amperage. Therefore the gauge is large and the wires are often covered with insulation.

In view of this, one of the objects of the invention is to provide a pole insulator which will permit the wires to be strung through a portion of the insulator bracket and to be supported in a manner so that the insulation is not frayed or damaged.

Another object is to provide an insulator assembly which, after the bracket is attached to the pole, will support the wires to be strung until they can be permanently secured with the usual tie wires.

Another object of the invention is to provide an insulator structure including a C-shaped bracket adapted to be attached to a pole, a spool shaped insulator attachable to said bracket by a pin which may be moved from normal supporting position, wherein the spool insulator is supported in a' vertical position, to an open position with the pin and insulator detached from the upper portion of the bracket and moved to one side, so that the wire may be inserted 'into the bracket and temporarily supported While stringing and tightening operations are being completed.

Still another object is to provide a supporting pin structure for spool insulators used on C-shaped brackets which can be moved to one side of the arms of the bracket, to an open position by a simple upward turning and tilting movement, and will drop into a locked or closed position by a reversed sequence of movements, but will not become dislodged from the locked position by any unintentional vibration or movement of the pole, or any whip or pulling of the line wire.

Still another object is the provision of a spool insulator supporting pin, as above described, which may be moved from locked position to an open position by a sequence of movements including an upward movement followed by an outward unlocking movement and then a transverse tilting movement of the supporting pin to an open position whereby an electric wire may be inserted between the arms of a C-shaped bracket, and in which the pin may be moved to a locked or holding position by a reverse of said movements; the pin and bracket parts being constructed so that, when locked, the pin will not become dislodged by any motion that may be accidentally applied to the insulator or wire in ordinary use.

Other objects will appear hereinafter.

I attain the foregoing objects by means of the devices, structures, parts and combination of parts shown in the accompanying drawings in which Figure 1 is a side elevation of an insulator bracket incorporating my improvements, shown attached to a supporting pole;

Figure 2 is a front elevation of the insulator bracket;

2,810,012 Patented Oct. 15, 1957 Figure 3 is a front elevation thereof with the insulator holding pin moved to open position;

Figure 4 is a top view of the bracket with the holding pin in closed position;

Figure 5 is a side view of the bracket showing an inter= mediate stage of its opening movement;

Figure 6 is a plan view of the end portion of the bottom arm of the bracket, drawn on an enlarged scale;

Figure 7 is a plan view of the end portion of the upper bracket arm, drawn on a similar enlarged scale; and

Figure 8 is a side elevational view of the insulator holding pin.

Similar numerals refer to similar parts in the several views.

Referring to the drawings, 2 indicates the bracket of my improved insulator ingeneral; 3 indicates a spool insulator of ceramic material; 4 indicates the insulator holding pin in general; and 5 the line wire.

Bracket 2 is C-shaped and includes an upper arm 6 and a lower arm 7 joined by the web 8. The web is secured to pole 10 by a lag screw 11 extending through a hole 12 in the middle of the web 8. Spurs 14, formed on the edges of the web portion, bite into the pole and prevent turning of the bracket on the screw 11.

Insulator pin 4 has a vertically extending shank 17 with a hook 21 formed at its top. This hook is composed of the horizontal bar 23 which terminates in the downwardly extending prong 22. On the upper portion of the shank there are parallel oppositely positioned flats 25 disposed below the lower end of prong 22. The faces of these flats extend in parallel planes at right angles to bar 23.

On the lower portion of shank 17 there are parallel lower flats 27 the faces of which extend parallel to bar 23.

The extreme lower end of shank 17 has a hole 39, bored parallel to bar 23, which receives cotter pin 40,

The upper arm 6 is provided with a hole 15 slotted toward the front end. The rounded portion 16 of this hole accommodates the shank 17 of insulator pin 41 with an easy sliding fit. The slotted portion 18 of this hole is narrower than portion 16 and normally will retain shank 17 of pin 4. A second hole 20 at about the middle of this upper arm receives the locking prong 22 of hook 21 on pin 4.

The lower arm 7 of bracket 2 has a hole 31 near its outer end disposed directly under slotted hole 15 in the upper arm. This hole has a rounded central portion 32 which receives the lower portion of shank 17 with a sliding fit and normally retains it in a vertical position.

Slotted portions 33 extend transversely of the arm from each side of the central portion 32. These receive and hold the lower flats 27 of pin shank 17 when it is tilted transversely to open position.

In operation, after the complete insulator bracket has been installed on pole 10 the pin 4 and insulator 3 is moved to open position. This is done by raising pin 4, as is indicated by dotted lines 4a (Fig. 5), until hook 22 clears hole 20 on the upper arm 6. Thereafter, pin 4 is rotated clockwise until bar 23 occupies the position indicated by dotted lines 23a (Fig. 4). The pin may.

then be tilted outward with the upper flats 25 clearing the slot portion 18 of upper hole 15. Pin 4 carrying the insulator 3 may be raised until lower flats 27 enter slot ted portions 33 of hole 32 in lower bracket 7. The pin 4 may then be tilted transversely of the body of the bracket 2 as shown in Figure 3. The insulator is then in open positon, and line wire 5 may be inserted through the gap 38 between the upper portion of the pin and the adjacent front portion of upper arm 6 (see Fig. 3).

With the line wire between the arms of bracket 2 the insulator pin may be moved to closed position, as shown.

3 in Figure 1, whereupon the line wire is confined by the insulator. It may thereafter be tightened and secured by tie wires in the usual manner.

To prevent complete withdrawal of the pin during the above operations and to prevent loss of the pin a cotter pin 49; is inserted through a transverse hole 39 near the bottom end of the shank of the pin.

it is to be noted that while the rounded central por tion 32 of hole 31 is large enough to permit the upper end of pin 4 to be moved outward through slotted portion 18 of hole 15, the slots 33 admit the lower flats 27 of pin 4 only and confine the outward tilting motion of the pin so that it does not move further than a distance necessary to clear the outer end of bracket arm 6.

Thus, while line wire 5 may easily be inserted through gap 33 when the insulator pin is in open position, and will lie on the inner portion of lower arm 7 during stringing, the pin, being tilted at an angle retains the wire and prevents it from sliding outward from the bracket and off the arm. To limit the transverse tilt of pin 4 shoulders 41 are provided at the ends of lower flats 27.

Although the opening movements of pin 4 from bracket body 2 have been specified in detail, yet in use this beone single continuous motion.

Cotter pin it) prevents complete withdrawal of pin 4. In use, such withdrawal is not necessary. Only sliding motion of pin 4 is necessary. Since opening motion is compound, and requires lifting rotation and tilting in two directions, accidental opening is impossible and unintentional opening extremely unlikely.

In Figure 5 the first upward opening motion is shown in dotted outline and marked 4a. The solid lines show the pin 4 with bar 23 turned outward. When stringing wires the pin sometimes falls in this position. The fit of the lower end of pin 4 in the rounded portion 32 of hole 31 prevents outward movement farther than that shown, and any line wire between bracket arms 6 and 7 will be retained within the bracket. Likewise, if the pin 4 is accidentally displaced upward by a blow on the lower end of pin 4, so that hook 21 is raised, as shown in Figure 5 at 4a, the pin 4 may possibly turn and be displaced and tilt outward, as shown in solid lines, and the weight of bar 23 may turn the pin outward; nevertheless the pin and insulator 3 will hold the included cable against accidental removal. There is triple safety locking. To unlock the pin must first be raised; second, turned 90; third, tilted laterally.

I claim:

1. A pole insulator for medium voltage line wires, having means for the prevention of accidental removal of a line wire therefrom, composed of a C-shaped bracket having parallel horizontally extending upper and lower arms; said upper arm having an insulating pin hole in its outer end portion joining a longitudinal slot adjoining said pin hole, of lesser width than the diameter of said pin hole, and extending to the end of said arm, and a prong hole disposed inward from said pin hole; said lower arm having an insulating pin hole, below the pin hole in said upper arm, provided with transversely extending slots adjoining each side edge having a width less than the diameter of said pin hole; an insulator pin having a vertical shank normally extending through said pin holes in said arms, having a locking hook at the top provided with a downwardly extending prong normally slidably inserted into the prong hole in said upper arm and preventing rotation of said pin, a pair of oppositely positioned flats on the upper portion of said shank disposed below said upper arm and having parallel faces extending transversely to said arm and spaced to slide within the slot adjoining the pin hole in said upper arm when said pin is raised and rotated 90 from normal position; a pair of flats on the lower portion of said pin shank having parallel faces parallel to said lower bracket arm and spaced apart to enter the transverse slots adjoining the pin hole in the lower bracket arm when said pin is raised A, from normal position, rotated and tilted transversely from said upper bracket arm to an open position; and a spool insulator on the shank of said insulator pin between said bracket arms.

2. A pole insulator for medium voltage line wires composed of a C-shaped bracket having parallel horizontally extending upper and lower arms; said upper arm having an insulating pin hole in its outer end portion joining a longitudinal slot adjoining said pin hole, of lesser width than the diameter of said pin hole, and extending to the end of said arm, and a prong hole disposed inward from said pin hole; said lower arm having an insulating pin hole, below the pin hole in said upper arm, provided with transversely extending slots adjoining each side edge having a width less than the diameter of said. pin hole; an insulator pin having a vertical shank normally extending through said pin holes in said arms, having a locking hook at the top provided with a downwardly extending prong normally slidably inserted into the prong hole in said upper arm and preventing rotation of said pin, a pair of oppositely positioned flats on the upper portion of said shank disposed below said upper arm and having parallel faces extending transversely to said arm and spaced to slide within the slot adjoining the pin hole in said upper arm when said pin is raised and rotated 90 from normal position; a pair of flats on the lower portion of said pin shank having parallel faces parallel to said lower bracket arm and spaced apart to enter the transverse slots adjoining the pin hole in the lower bracket arm when said pin is raised from normal position, rotated 90, and tilted transversely from said upper bracket arm to an open position; and a spool insulator on the shank of said insulator pin between said bracket arms and a transverse cotter pin on the lower end of said insulator pin shank; said insulator pin being adapted to move from normal position with the pin and insulator closing the ends of said bracket arms to an open position with the pin disengaged from said upper bracket arm and the pin and insulator tilted transversely to one side of said upper bracket arm to admit a line wire between said bracket arms by, first raising said pin until said prong disengages from said prong hole, second rotating said pin until said upper flats parallel the slot adjoining said pin hole in said upper arm bracket, third, moving the upper portion of said insulator pin outward through said slot clearing said upper arm, and then tilting the upper portion of the pin transversely of said bracket upper arm providing an opening between the outer portion of said upper arm and the upper end of said insulator pin to admit a line wire, whereby accidental opening of the bracket structure is extremely unlikely.

3. A pole insulator, having structure to prevent accidental dislodgment of a line wire supported thereby, consisting of a C-shaped bracket having a web for attaching to a vertical pole, parallel upper and lower arms extendrug horizontally from said web; said upper arm having an insulator pin hole near its outer end adjoining a longitudinal slot of less width extending to the end of said arm, and a locking prong hole disposed interm diate the length of said arm; said lower arm having an insulator pin hole, in its outer portion, vertically aligned with said pin hole in said upper bracket, with transverse slots extending on each side of said hole; an insulator pin having a vertical shank extending through and retained by said insulator pin holes in said bracket arms, having a hook at the top including a horizontal bar with a locking prong at the end thereof extending downwardly therefrom and engaging in said locking prong hole; a spool insulator, having an axial hole, supported on said pin shank; said pin shank having parallel flats formed on its upper end portion extending transversely to the slot adjoining the pin hole in said upper arm and disposed so that the upper portion of said pin may be tilted forwardly through said slot from said pin hole in said upper bracket when said locking prong is raised so that it clears said locking prong hole, and said pin shank rotated until said flats parallel the edges of said slot; said pin shank having parallel flats on its lower end portion enabling said pin to be tilted transversely to said lower arm after it is freed from the hole in said upper arm.

References Cited in the file of this patent UNITED STATES PATENTS Pittman et al. Sept. 9, 1941 Pittman et a1 Sept. 9, 1941 Oliver Aug. 22, 1950 

